diff --git a/generate.py b/generate.py
index f43f85e..3047629 100644
--- a/generate.py
+++ b/generate.py
@@ -16,13 +16,7 @@ def sine(dur, freq, value=1):
         signal=soundbox.sine(dur, freq, value))
 
 
-def square(dur, freq, value=1):
-    return soundbox.envelope(
-        attack=.2, decay=.2, release=.2,
-        signal=soundbox.square(dur, freq, value))
-
-
-signal = soundbox.silence(9)
+signal = soundbox.silence(10)
 
 chords_l = (
     (('do', 2),),
@@ -46,9 +40,9 @@ for shift in (.5, 4.5):
     for i in range(len(chords_l)):
         soundbox.add_signal(signal, start=i / 2 + shift,
             source=soundbox.chord(
-                instr=square, dur=.4,
+                instr=sine, dur=.8 if shift == 4.5 and i == 7 else .4,
                 freqs=soundbox.note_freqs(chords_l[i]),
-                value=.04
+                value=.4
             ))
 
     for i in range(len(chords_r)):
@@ -56,7 +50,7 @@ for shift in (.5, 4.5):
             source=soundbox.chord(
                 instr=sine, dur=1.1,
                 freqs=soundbox.note_freqs(chords_r[i]),
-                value=.5
+                value=.4
             ))
 
 soundbox.save_signal(output_file, signal)
diff --git a/soundbox.py b/soundbox.py
index a55f624..b3a04ce 100644
--- a/soundbox.py
+++ b/soundbox.py
@@ -1,6 +1,5 @@
 import wave
 import numpy as np
-import scipy.signal as sig
 import math
 
 # Nombre d’octets par échantillon
@@ -26,11 +25,6 @@ def sine(dur, freq, value=1):
     return value * max_val * np.sin(2 * np.pi * freq * x / samp_rate)
 
 
-def square(dur, freq, value=1):
-    x = np.arange(int(samp_rate * dur))
-    return value * max_val * sig.square(2 * np.pi * freq * x / samp_rate)
-
-
 def envelope(attack, decay, release, signal):
     total = len(signal)
     attack = int(attack * total)
diff --git a/sounds/synth.wav b/sounds/synth.wav
index aa3449e..e03bd48 100644
Binary files a/sounds/synth.wav and b/sounds/synth.wav differ